KR100562717B1 - Printing sheet and method of preparation of the same - Google Patents

Abstract

The present invention relates to a recording sheet for printing characters or images, and a method of manufacturing the same. More specifically, by using a translucent plastic film as a base sheet, the recording sheet is optimized by a high-quality printing effect and an efficient process. And a method for producing the same, and a preferable use of the recording sheet. The present invention provides a recording sheet comprising a translucent plastic film base sheet, an ink absorbing layer, and a manufacturing method thereof. The ink absorbing layer is 30 to 60% by weight of a polyvinyl alcohol-vinyl acetate copolymer and 30 to 60% by weight of an acryl-based modified resin (non-crosslinking type), 3 to 10% by weight of an amide tetravalent ammonium salt as an ink fixing agent, and an antifoaming agent. An ink absorber layer composition containing 0.5 to 5 wt%, inorganic filler 0.5 to 5 wt%, and leveling agent 0.5 to 5 wt% may be formed by coating. The recording sheet of the present invention is particularly useful for lighting advertisements. The present invention uses a translucent plastic film as a base sheet to have high light transmittance and hiding power, thereby eliminating a separate process (white layer formation) to have a high quality printing effect and hiding power, thereby simplifying the manufacturing process and structure. It has the effect to reduce.

Record sheet, ink, plastic film, lighting advertisement, light transmissive, translucent

Description

Record sheet and manufacturing method thereof {PRINTING SHEET AND METHOD OF PREPARATION OF THE SAME}

1 is a cross-sectional configuration diagram showing an exemplary embodiment of a recording sheet according to the present invention.

FIG. 2 illustrates a process in which ink is absorbed into the ink absorbing layer in the recording sheet of FIG. 1. In FIG. 2, the left figure is immediately after the ink is ejected (before fixation), and the right figure is after the ink is fixed. It looks.

Explanation of symbols on the main parts of the drawings

1 ink absorption layer 2 base sheet

3: ink

The present invention relates to a recording sheet on which characters, images and the like are printed, and a manufacturing method thereof. In particular, the present invention relates to a recording sheet and a method of manufacturing the same, and a preferable use of the recording sheet by using a semi-transparent plastic film as a base sheet, optimizing the manufacturing cost by an efficient process with high-quality printing effect.

BACKGROUND OF THE INVENTION In the method of recording letters, images, and the like on a recording sheet, in recent years, with the rapid spread of computers and the improvement of performance, the hard copy recording method has been rapidly developed. The hard copy recording method that can digitize and express an image away from the existing cutting format advertisement has been gradually used due to the maximization and ease of advertisement effect. Such hard copy recording methods include a sublimation transfer recording method, an electrophotographic method, and an inkjet method, among which, a printer using an inkjet method ejects ink in the form of droplets from the nozzle of the cartridge to the print media in the form of droplets. In order to print characters or images, color and miniaturization are easy, print quality is excellent, and workability is rapidly spreading compared to existing methods. Such a recording method by an inkjet printer can express a high quality image similar to a photograph, and is easy to enlarge, and is expected to be applied to industrial fields, such as a large signboard.

In particular, the image quality by the inkjet printer greatly influences not only the performance of the computer or the like but also the performance of the recording sheet.

The recording sheet (printing sheet) printed by the hard copy recording method including the general office use and used for displaying a print image of an advertisement or a poster has at least a base sheet and an ink absorbing layer. At this time, the base sheet should have sufficient supporting force, and the ink absorbing layer is required to have excellent ink absorbing ability to sufficiently absorb ink. In addition, the base sheet should have water resistance according to the intended use and use.

In particular, the recording sheet for illumination in which the ink on the image surface is colored by light emission by illumination light should have translucency together with light transparency. To this end, conventionally, several layers other than the base sheet and the ink absorbing layer are further laminated. Specifically, a transparent plastic film was used as the base sheet, and a white layer for imparting translucency was coated thereon to increase the hiding power, and was formed by coating the ink absorbing layer again. However, this improves the clarity and the lighting effect, but there is a problem in that the manufacturing process is increased and the manufacturing cost is increased.

In Korean Patent Laid-Open No. 10-2003-0033445, a transparent PVC layer is laminated on an upper surface of a transparent polyester film layer by an adhesive layer, and an ink media layer (ink absorbing layer) is formed thereon, and a lower surface of the transparent polyester film layer A semi-transparent laminated sheet for PC due diligence printing by adhesively laminating a white PVC sheet with an adhesive layer is proposed. In addition, Korean Patent Publication No. 10-2000-0031009 discloses a print film for an inkjet printer in which three layers of an opaque protective layer which protects a transparent base film, an ink absorbing layer, and an ink absorbing layer and improves the whiteness of the film are sequentially stacked. It is.

As described above, by using a transparent plastic film as a base sheet, a separate white layer (a white PVC sheet, an opaque protective layer, etc.) is laminated to impart translucency, thereby increasing the manufacturing process and reducing print quality and manufacturing cost. There was an issue that was raised.

The present invention has been invented to solve the conventional problems as described above, by using the base sheet as a semi-transparent plastic film to give its own hiding power characteristics and light transmittance to have a high-quality printing effect and at the same time the manufacturing process and structure It is an object of the present invention to provide a recording sheet and a method of manufacturing the same, which can simplify manufacturing costs.

In addition, the present invention is to provide a recording sheet and a method of manufacturing the same that has excellent quality and excellent light coloration effect by having a good gloss expression with an excellent ink absorption ability and coating properties by appropriately constituting the components constituting the ink absorption layer. There is another purpose.

In addition, another object of the present invention is to provide a recording sheet and a method of manufacturing the same having improved water resistance by laminating a protective film on the printing surface of the recording sheet.

In order to achieve the above object, the present invention provides a recording sheet including a base sheet of a translucent plastic film and an ink absorbing layer.

In addition, the present invention comprises the steps of preparing a base sheet of a translucent plastic film, 30 to 60% by weight of polyvinyl alcohol-vinyl acetate copolymer and 30 to 60% by weight of an acrylic modified resin (non-crosslinked) as an absorbent resin, ink fixing An ink absorbing layer composition containing 3 to 10% by weight of an amide-based tetravalent ammonium salt, 0.5 to 5% by weight of an antifoaming agent, 0.5 to 5% by weight of an inorganic filler, and 0.5 to 5% by weight of a leveling agent is coated on the upper surface of the base sheet. It provides a method for producing a recording sheet comprising a step.

The recording sheet of the present invention is a recording sheet of a laminated structure in which a character, an image, or the like is recorded (printed), and is used for displaying printed images of advertisements and posters, including general office use. In particular, it is useful as a recording sheet to be used for advertising by causing the ink on the printing surface to be colored by light transmission by illumination (hereinafter referred to as "light advertising"), and is preferably printed by a recording method by an inkjet printer.

Hereinafter, the present invention will be described in detail.

The recording sheet of the present invention comprises a base sheet and an ink absorbing layer. Preferably, the ink absorbing layer is laminated on the upper surface of the base sheet. At this time, the base sheet is translucent as a plastic film according to the present invention. Specifically, the base sheet has a hiding power (slightly opaque) but relatively translucent high translucency, although not particularly limited, a plastic film having a total light transmittance of 30 to 90% is preferable. At this time, when the total light transmittance is less than 30% or more than 90%, the hiding power may be low or high, resulting in deterioration of the image quality of the recording.

Specifically, the base sheet is a translucent plastic film made of a synthetic resin film. Here, the synthetic resin includes transparent and translucent synthetic resins as thermoplastic resins or thermosetting resins. In this case, when using a transparent synthetic resin, one or two selected from a white inorganic material, such as titanium oxide, zinc oxide, synthetic silica, talc, kaolinite, calcium carbonate, alumina, zeolite, organic white pigment, etc. The inorganic material may be added to make it translucent, or the transparent synthetic resin may be prepared on a transparent plastic film and then subjected to physical processing to have translucency. More specifically, the base sheet may be a translucent one or more selected from a polyester film, a polystyrene film, a polypropylene film, a polycarbonate film, an acrylic film, glass, or the like, and may be used. In the present invention, the plastic film includes translucent glass, and the glass includes surface-treated and translucent glass. Preferably, a translucent polyester film having excellent bearing capacity and excellent thermal stability is used.

The base sheet is not particularly limited, but the thickness thereof is appropriately about 0.03 to 0.3 mm. In this case, when the thickness is less than 0.03mm, it may not have sufficient supporting force, and when the thickness is greater than 0.3mm, workability may be deteriorated during printing by the inkjet printer.

The ink absorbing layer comprises transparent and translucent and is preferably transparent. The ink absorbing layer is formed by coating an ink absorbing layer composition having ink absorbing ability, and the ink absorbing layer composition is basically composed of an absorbent resin. Absorbent resins are those that absorb ink, such as polyvinyl alcohol, polyvinyl alcohol-vinyl acetate high polymer, ethylene-vinyl acetate copolymer, acrylic resin, styrene-acrylic copolymer, polyvinyl butyral, polyvinylpyrrolidin It is preferable that one or two or more selected from polyurethane, polyacrylamide, polyester resin, styrene-butadiene rubber and the like are mixed.

The ink absorbing layer composition may be added a leveling agent for improving the leveling (smoothness) during coating, a defoaming agent used for the purpose of defoaming and defoaming of the coating liquid. The leveling agent and the antifoaming agent may be selected from conventional surfactants. As the surfactant, cationic, anionic, nonionic, and the like may be used, and although not particularly limited, a surfactant which is silicone-based or fluorine-based is preferable. Silicone surfactants include acrylic silicone, vinyl benzyl silane, amino silane, acrylic silane, dimethyl silane, polymethyl siloxane, polydimethyl siloxane, polymethylalkyl siloxane, hydrodiene modified siloxane, vinyl modified siloxane, amino modified siloxane, and carboxyl. Compound-modified siloxane, epoxy-modified siloxane, fluorine-modified siloxane, alkyl-modified siloxane, phenol-modified siloxane and the like can be used, and fluorine-based surfactants include tetraunsaturated ethylene, perfluoroalkyl ammonium salts, perfluoroalkyl potassium and perfluoroalkyl ethylene oxide additives. , Perfluoro alkyl compounds, perfluoro alkyl halogen compounds and the like can be used. It is good to add such surfactant in the range which does not reduce ink absorption ability, Specifically, 1-30 weight% of ink absorption layer solid content is good.

In addition, various additives may be added to the ink absorbing layer composition in a range that does not lower ink absorbing ability and other physical properties. For example, an ink fixing agent, a fluorescent pigment, a plasticizer, an ultraviolet absorber, an inorganic filler, a viscosity modifier, etc. Can be added. As the ink fixing agent, strong cationic amide tetravalent ammonium salts, allyl salts, urethane salts, polyethylene amine salts, polyvinylamine salts, acrylamide copolymer salts, etc. may be used. Dixanthylene, ansparapyrimidine, rhodamine, eosin, brilliant sulfoflaven FF, pyramidine and the like can be selected and used as a plasticizer, dioctyl phthalate (DOP: DiOctyl Phthalate), dibutyl phthalate (DBP: DiButyl Phthalate), Dioctyl Adipate (DOA: DiOctyl Adipate), Triglyceride, Dioctyl Maleate, Trimellit and the like can be used. As the ultraviolet absorber, 2- (5-methyl-2-hydroxyphenyl) benzotriazole, 2- [2-hydroxy-3,5-bis (dimethylbenzyl) phenyl] -2H-benzotriazole, 2 -(3-T-butyl-5-methyl-2-hydroxyphenyl) -5-chlorobenzotriazole, 2- (3,5-di-T-butyl-2-hydroxyphenyl) -5-chlorobenzo Triazoles, 2- (4,6-diphenyl-1,3,5-triin-2-yl) -5- (hexyl) oxyphenol, hydroxyphenylbenzotriazole derivatives and the like can be used, As the zero, porous silica, talc, titanium oxide, zinc oxide, synthetic silica, kaolinite, calcium carbonate, alumina, zeolite, organic white pigment, and the like can be used, and the viscosity adjusting agent includes water, an organic solvent (alcohol, etc.), and the like. Can be used. Here, the viscosity modifier is added to improve the coating property, it is preferable that the ink absorption layer composition is appropriately added so as to have a viscosity of 100 ~ 500cps.

Further, according to the present invention, in forming the ink absorbing layer composition, 30 to 60 wt% of a polyvinyl alcohol-vinyl acetate copolymer as the water absorbent resin, 30 to 60 wt% of the acrylic modified resin (non-crosslinking type), and amide as a fixing agent It is preferable to formulate it so that 3-10 weight% of system tetravalent ammonium salts, 0.5-5 weight% of antifoamers, 0.5-5 weight% of inorganic additives, and 0.5-5 weight% of leveling agents are contained. In this case, it has excellent ink absorption and smoothness, and improves glossiness, which is particularly suitable as a recording sheet for lighting advertisement.

The ink absorbing layer composition is coated on the base sheet, and then, for example, is hot air dried to be fixed to the base sheet, but the coating method is not particularly limited, for example, a gravure coating method, a kiss coating method, a spray coating method, It can be selectively applied from knife coating method, blade coating method, reverse roll coating method, bar coating method, die coating method and the like. At this time, the coating amount is preferably such that the thickness after drying is about 3 ~ 30㎛. That is, it is preferable that the ink absorbing layer is coated so as to have a thickness of 3 to 30 µm. When the thickness of the ink absorbing layer is less than 3 μm, the ink absorbing ability may be degraded and the ink may be smeared. When the thickness of the ink absorbing layer is less than 30 μm, workability may be degraded because the image is less sharp and the coating film is weakened.

1 shows an exemplary embodiment of a recording sheet according to the present invention. That is, the state of the two-layer structure comprised of the base sheet 2 of the translucent plastic film of the recording sheet of this invention, and the ink absorbing layer 1 laminated | stacked on the upper surface of this base sheet 2 was illustrated. 2 illustrates a process in which the ink 3 is absorbed by the ink absorbing layer 1. In FIG. 2, the left figure shows the state immediately after the ink 3 is injected (before fixation), and the right figure shows the state after the ink 3 is fixed.

Therefore, the recording sheet of the present invention is obtained by absorbing the ink 3 into the ink absorbing layer 1 to cause color development, and then viewing it from the printed side. Of course, you can also watch from the base sheet. The ink 3 may be an ink 3 having any surface tension and viscosity. For example, both the dye ink in which dye particles are dissolved in water and the pigment ink in which pigment ink is dispersed in water may be used.

As described above, the recording sheet according to the present invention has a high light transmissive property and high glossiness and high glossiness by using a semi-transparent plastic film and an appropriately absorbing ink absorbing layer. When used for lighting advertising, it has excellent lighting color development and can express high quality images similar to photographs.

Therefore, the present invention does not need to form a separate white layer as in the prior art with a high-quality printing effect by using a semi-transparent plastic film to have a self-closing power in the base sheet manufacturing process and structure is simple There is a feature to reduce the. In addition, the proper composition of the ink absorbing layer makes it possible to provide gloss expression with excellent ink absorption ability in the state of excellent coating property and smoothness.

Further, according to the present invention, the printing surface protection film can be laminated on the printing surface, that is, on the upper surface of the ink absorbing layer after the ink is fixed and printed according to the use purpose of the recording sheet. Such a printed surface protective film is useful when used for advertising purposes such as signboards requiring water resistance. The printing surface protection film is a transparent plastic film, and includes a laminated or separately manufactured transparent plastic film by a method in which a transparent synthetic resin is coated on a printing surface.

In addition, according to the present invention, the lower surface of the base sheet, that is, the opposite side to the surface on which the ink absorbing layer of the base sheet is laminated can be processed in various ways within a range that does not reduce the light transmittance. For example, a matte treatment or slip treatment, or a separate layer containing an antiblocking agent and / or an antistatic agent may be formed.

Hereinafter, test examples of the present invention will be described. However, the present invention is not limited to the specific test examples described above, and any person skilled in the art without departing from the gist of the present invention as claimed in the claims may make various modifications. It is possible that such modifications are also within the scope of the claims.

Example 1

As the base sheet, a translucent polyester film having a total light transmittance of 30% or more was used. Then, 50% by weight of the polyvinyl alcohol-vinyl acetate copolymer as the water absorbent resin, 45% by weight of the acrylic modified resin (non-crosslinked), 3.5% by weight of the amide tetravalent ammonium salt as the ink fixing agent, and 0.5% by weight of the polydimethylsiloxane as the antifoaming agent. , 0.5% porous silica as an inorganic filler and 0.5% by weight of acrylic silicone as a leveling agent were added, followed by the addition of an aqueous alcohol solution to obtain an ink absorbent composition having a viscosity of 300 cps. The ink absorbent composition was completely crosslinked by hot air drying by a continuous process while adjusting the coating thickness to 12 to 13 μm using a knife coating method on a base sheet (translucent polyester film). The recording sheet manufactured according to this embodiment has a two-layer structure in which the ink absorbing layer 1 is laminated on the semitransparent polyester film base sheet 2 as shown in FIG.

Example 2

As the base sheet, a translucent polyester film having a total light transmittance of 30% or more was used. Then, 50% by weight of polyvinyl butyric alcohol as absorbent resin, 45% by weight of acrylic modified resin (non-crosslinked), 4.0% by weight of amide-based ammonium salt as fixing agent, 0.5% by weight of polydimethylsiloxane as antifoaming agent, acrylic as leveling agent 0.5 wt% of silicone was blended and then water was added to obtain an ink absorbent composition having a viscosity of 300 cps. The ink absorbent composition was completely crosslinked by hot air drying by a continuous process while adjusting the coating thickness to 12 to 13 μm using a knife coating method on a base sheet (translucent polyester film). The recording sheet produced according to this embodiment has the same structure as in Example 1 (Fig. 1).

[Comparative Example]

As the base sheet, a transparent polyester film was used. Coating and curing the ink absorbing layer composition consisting of 80% by weight of silica, 15% by weight of polyvinyl alcohol and 5% by weight of dye fixing agent on the upper surface of the transparent polyester film, and then again on the glossy expression layer composition consisting of silica and acrylic adhesive The coating was cured. Then, a white PVC sheet was laminated on the lower surface of the transparent polyester film with an adhesive to prepare a recording sheet having a four-layer structure consisting of a white PVC sheet, a transparent polyester film, an ink absorbing layer, and a glossiness expressing layer from below. It was.

The printing sheet samples according to Examples 1 and 2 and Comparative Examples were printed by a color inkjet printer, and then glossiness and image quality were evaluated. The inkjet printer used EPSON STYUS PHOTO 750, and glossiness was evaluated by the amount of specular reflection with respect to the incident angle of 75 degrees. Image quality was visually measured using character sharpness, smearing, and drying speed as printing factors. The results are shown in the following [Table 1].

division Layer structure Glossiness (%) Image quality (◎: Good, △: Normal, B :: Poor) Character clarity Load Drying speed Example 1 Two layer structure consisting of base sheet and ink absorbing layer 74 ◎ ◎ ◎ Example 2 Two layer structure consisting of base sheet and ink absorbing layer 68 △ ◎ ◎ Comparative example 4-layer structure consisting of white PVC sheet, base sheet, ink absorbing layer and gloss expressing layer 45 △ △ ◎

As shown in Table 1, the recording sheet according to the embodiment of the present invention is superior to the comparative example showing the prior art in terms of glossiness and image quality even though it is composed of two layers as a simple laminated structure. Accordingly, in order to impart translucency to the recording sheet, excellent glossiness is achieved by a semitransparent base sheet and an appropriately formulated ink absorbing layer without laminating a separate white layer (comparative white PVC sheet) as in the conventional (comparative example). And while exhibiting image quality, the structure is particularly simple and the manufacturing process is simple.

Therefore, the present invention is completed by laminating only the ink absorbing layer on the translucent plastic film without requiring a white layer forming process for imparting semitransparency by using the translucent plastic film to have its own hiding power as illustrated in the above embodiment. Therefore, the manufacturing process and its structure can be simplified to reduce the manufacturing cost.

As described above, the present invention uses a semi-transparent plastic film as a base sheet to have high light transmittance and hiding power, thereby eliminating a separate process (white layer formation) to have high quality printing effect and hiding power. Simple structure has the effect of reducing the manufacturing cost. In addition, by properly forming an ink absorbing layer, it has excellent ink absorbing ability and gloss expression, and is particularly effective when the image is recorded by an inkjet printer and used for lighting advertisements, so that an image of high quality that is similar to a photograph can be expressed with excellent lighting color development. Has

Claims (15)

delete delete A recording sheet comprising a base sheet of a translucent plastic film and an ink absorbing layer, The ink absorbing layer is 30 to 60% by weight of a polyvinyl alcohol-vinyl acetate copolymer and 30 to 60% by weight of an acryl-based modified resin (non-crosslinking type), 3 to 10% by weight of an amide tetravalent ammonium salt as an ink fixing agent, and an antifoaming agent. A recording sheet formed by coating an ink absorbing layer composition containing 0.5 to 5% by weight, inorganic filler to 0.5 to 5% by weight, and leveling agent to 0.5 to 5% by weight. The method of claim 3, The base sheet is a recording sheet, characterized in that translucent as having a total light transmittance of 30 to 90%. The method of claim 3, The base sheet is a recording sheet, characterized in that the thickness of 0.03 ~ 0.3mm. The method of claim 3, The base sheet is a recording sheet, characterized in that the translucent one or two or more selected from polyester film, polystyrene film, polypropylene film, polycarbonate film, acrylic film and glass. The method of claim 3, And the ink absorbing layer has a thickness of 3 to 30 µm. The method of claim 3, And a printing surface protective film laminated on an upper surface of the ink absorbing layer. The method according to any one of claims 3 to 8, The recording sheet, characterized in that the recording sheet is used for lighting advertising. The method according to any one of claims 3 to 8, And the recording sheet is recorded by an inkjet printer recording method. Preparing a base sheet of a translucent plastic film, 30 to 60% by weight of polyvinyl alcohol-vinyl acetate copolymer, 30 to 60% by weight of acrylic modified resin (non-crosslinking type) as water absorbent resin, 3 to 10% by weight of amide-based tetraammonium salt as ink fixing agent, 0.5 to 5% by weight of antifoaming agent And coating an upper surface of the base sheet with an ink absorbing layer composition containing%, an inorganic filler of 0.5 to 5% by weight, and a leveling agent of 0.5 to 5% by weight. The method of claim 11, The base sheet is a manufacturing method of a recording sheet, characterized in that the addition of a white inorganic material to a transparent synthetic resin made of a translucent plastic film. The method of claim 11, And fixing the ink to the ink absorbing layer, and then laminating a printing surface protection film on the printing surface. The method of claim 11, The ink absorbing layer composition has a viscosity of 150 to 500 cps. The method of claim 11, The coating of the ink absorbing layer composition is a method of manufacturing a recording sheet, characterized in that the coating on the upper surface of the base sheet using a knife coating method.

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